scsi: target: Replace all non-returning strlcpy() with strscpy()

strlcpy() reads the entire source buffer first.  This read may exceed the
destination size limit.  This is both inefficient and can lead to linear
read overflows if a source string is not NUL-terminated [1].  In an effort
to remove strlcpy() completely [2], replace strlcpy() here with strscpy().
No return values were used, so direct replacement is safe.

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
[2] https://github.com/KSPP/linux/issues/89Signed-off-by: Azeem Shaikh <azeemshaikh38@gmail.com>
Link: https://lore.kernel.org/r/20230516025322.2804923-1-azeemshaikh38@gmail.comReviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/target/iscsi/iscsi_target_parameters.c

@@ -726,8 +726,8 @@ static int iscsi_add_notunderstood_response(
 	}
 	INIT_LIST_HEAD(&extra_response->er_list);
 
-	strlcpy(extra_response->key, key, sizeof(extra_response->key));
-	strlcpy(extra_response->value, NOTUNDERSTOOD,
+	strscpy(extra_response->key, key, sizeof(extra_response->key));
+	strscpy(extra_response->value, NOTUNDERSTOOD,
 		sizeof(extra_response->value));
 
 	list_add_tail(&extra_response->er_list,

drivers/target/iscsi/iscsi_target_util.c

@@ -1321,7 +1321,7 @@ void iscsit_collect_login_stats(
 		if (conn->param_list)
 			intrname = iscsi_find_param_from_key(INITIATORNAME,
 							     conn->param_list);
-		strlcpy(ls->last_intr_fail_name,
+		strscpy(ls->last_intr_fail_name,
 		       (intrname ? intrname->value : "Unknown"),
 		       sizeof(ls->last_intr_fail_name));
 
@@ -1360,7 +1360,7 @@ void iscsit_fill_cxn_timeout_err_stats(struct iscsit_session *sess)
 		return;
 
 	spin_lock_bh(&tiqn->sess_err_stats.lock);
-	strlcpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
+	strscpy(tiqn->sess_err_stats.last_sess_fail_rem_name,
 			sess->sess_ops->InitiatorName,
 			sizeof(tiqn->sess_err_stats.last_sess_fail_rem_name));
 	tiqn->sess_err_stats.last_sess_failure_type =

drivers/target/target_core_configfs.c

@@ -649,7 +649,7 @@ static void dev_set_t10_wwn_model_alias(struct se_device *dev)
 	 * here without potentially breaking existing setups, so continue to
 	 * truncate one byte shorter than what can be carried in INQUIRY.
 	 */
-	strlcpy(dev->t10_wwn.model, configname, INQUIRY_MODEL_LEN);
+	strscpy(dev->t10_wwn.model, configname, INQUIRY_MODEL_LEN);
 }
 
 static ssize_t emulate_model_alias_store(struct config_item *item,
@@ -675,7 +675,7 @@ static ssize_t emulate_model_alias_store(struct config_item *item,
 	if (flag) {
 		dev_set_t10_wwn_model_alias(dev);
 	} else {
-		strlcpy(dev->t10_wwn.model, dev->transport->inquiry_prod,
+		strscpy(dev->t10_wwn.model, dev->transport->inquiry_prod,
 			sizeof(dev->t10_wwn.model));
 	}
 	da->emulate_model_alias = flag;
@@ -1426,7 +1426,7 @@ static ssize_t target_wwn_vendor_id_store(struct config_item *item,
 	}
 
 	BUILD_BUG_ON(sizeof(dev->t10_wwn.vendor) != INQUIRY_VENDOR_LEN + 1);
-	strlcpy(dev->t10_wwn.vendor, stripped, sizeof(dev->t10_wwn.vendor));
+	strscpy(dev->t10_wwn.vendor, stripped, sizeof(dev->t10_wwn.vendor));
 
 	pr_debug("Target_Core_ConfigFS: Set emulated T10 Vendor Identification:"
 		 " %s\n", dev->t10_wwn.vendor);
@@ -1482,7 +1482,7 @@ static ssize_t target_wwn_product_id_store(struct config_item *item,
 	}
 
 	BUILD_BUG_ON(sizeof(dev->t10_wwn.model) != INQUIRY_MODEL_LEN + 1);
-	strlcpy(dev->t10_wwn.model, stripped, sizeof(dev->t10_wwn.model));
+	strscpy(dev->t10_wwn.model, stripped, sizeof(dev->t10_wwn.model));
 
 	pr_debug("Target_Core_ConfigFS: Set emulated T10 Model Identification: %s\n",
 		 dev->t10_wwn.model);
@@ -1538,7 +1538,7 @@ static ssize_t target_wwn_revision_store(struct config_item *item,
 	}
 
 	BUILD_BUG_ON(sizeof(dev->t10_wwn.revision) != INQUIRY_REVISION_LEN + 1);
-	strlcpy(dev->t10_wwn.revision, stripped, sizeof(dev->t10_wwn.revision));
+	strscpy(dev->t10_wwn.revision, stripped, sizeof(dev->t10_wwn.revision));
 
 	pr_debug("Target_Core_ConfigFS: Set emulated T10 Revision: %s\n",
 		 dev->t10_wwn.revision);

drivers/target/target_core_device.c

@@ -789,10 +789,10 @@ struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
 	xcopy_lun->lun_tpg = &xcopy_pt_tpg;
 
 	/* Preload the default INQUIRY const values */
-	strlcpy(dev->t10_wwn.vendor, "LIO-ORG", sizeof(dev->t10_wwn.vendor));
-	strlcpy(dev->t10_wwn.model, dev->transport->inquiry_prod,
+	strscpy(dev->t10_wwn.vendor, "LIO-ORG", sizeof(dev->t10_wwn.vendor));
+	strscpy(dev->t10_wwn.model, dev->transport->inquiry_prod,
 		sizeof(dev->t10_wwn.model));
-	strlcpy(dev->t10_wwn.revision, dev->transport->inquiry_rev,
+	strscpy(dev->t10_wwn.revision, dev->transport->inquiry_rev,
 		sizeof(dev->t10_wwn.revision));
 
 	return dev;